Thomas



(No Model.) 2 Sheets-Sheet '1.

T'. G. J. THOMAS.

. LAMP. No. 256,930. Patented Apr.25, 1882.

Win 44 w THOMAS c. J. THOMAS, OF 54, 55, AND MINORIES, COUNTY OF MIDDLESEX,

PATENT Qrntcnt ENGLAND.

LAMP.

SPECIFICATION forming part of Letters Patent No. 256,930, dated April 25, 1882,

Application filed October 3, 1881. (No model.) Patented in England June 26, 1880, in France December 2-2, 1880, and in Belgium December 24, 1880.

To all whom it may concern Be it known that I, THOMAS COOPER JOHN THOMAS, a subject of the Queen of Great Britain and Ireland, residing at 54, 55, and 56 Minories, in the county 0t Middlesex, Kingdom of Great Britain and Ireland, have invented new and useful Improvementsin Lamps, (for which I have obtained patents in Great Britain, No. 2,604, bearingdate June 26, 1880, in France, No. 140,278, hearing date December 22, 1880, and in Belgium, No. 53,412 hearing date December 24, 1880,) of which the following is a specification.

I construct a lamp (to burn either oil, gas, or candle) wherein the flame is contained in a metallic chimney, which at its lower end surrounds the burner,the cone of which is attached to the chimney. The chimney is formed with a hole or holes, around which is or are secured the inner end or ends of a chamber or chambers of parabolic form in longitudinal section, and radiating from the chimney with the larger diameter outward. The chamber or chambers terminates or terminate at the chimney, and the outer end or ends of the chamber or chambers is or are closed with glass ofany suitable description. It may be by alens or lenses. The form of chamber may be varied. It may be conical or of square or polygonal cross-section, so long as there is a gradual widening toward the outer or glazed end. In lamps having an odd number of such chambers as above referred to I prefer to employ round wicks. \Vhen four such chambers are employed I use a flat-wick burner with its slot arranged diagonally, so as to present, as nearly as may be, an equal amount of light to each chamber. By inclosing the light in the chimney, as described, I am enabled to im prove the combustion and obviate the darkening of the chambers by smoke, which is liable to occur where the flumeis in the chambers themselves.

The air necessary to support combustion is admitted at the upper part of the lamp, passes downward, and reaches the flame through the burner or slot, (the products of combustion escaping by the chimney.) I provide around the upper part of the chimney a second or inner space for the circulation of air between itself and the chimney, to prevent overheatingof the outer casing of the lamp.

In the drawings, Figure 1 is a vertical sectional elevation of a lamp according to myiuvention. Fig. l'- is a detail showing the guardplate placed around the row of perforations on the lamp-body.

Fig. 2 is a plan of the same, partly in section in line at w of Fig. 1; and Fig. 3 is a horizontal cross-section of the same in line y y of Fig. 1. A is the oil tank or reservoir; B, the wick-tube, provided with holes B B for the escape of vaporized oil; (J, the burner with its slot arranged diagonally in relation to the parabolic reflectors, (see Fig. 3,) and F the milled head of the wick-pinion Spindle. The whole of the above parts are connected together, and are attached by a hingedjoint, (not shown,) and secured by a catch to the upper part of the lantern. G is a metal chimney with holes at H H H H for the emission of light. Around these holes are secured the inner ends of the parabolic chambers J J, made of bright or retlecting material. The outer ends of the chambers are closed by sheets of glass K K K K,

carried in frames L L, which may be made to slide in ways on the side of the lamp. Around the upper part of the chimney is a perforated plate, N, furnished with a tubular deflector, guide, or wall, M, so arranged as to leave an annular space, S, for the circulation of air between M and the chimney, to prevent overheating of the outer casing, T, of the lamp. 0 is a deflector attached to the cover P. Q Q are ventilatin g-holes protected against drafts by a guard-plate, Q, which surrounds the perforated portion Q and prevents the dircctpassage of air to the chamber within, and R R are small holes communicating-from the chambers into the body of the lamp.

Figs. 4, 5, and 6 are horizontal cross-sections in line 3 y of Fig. 1, showing lamps with one, two, and three reflecting-chambers, respectively, for various uses.

Fi 7, Sheet 2, is a longitudinal sectional elevation of a large lamp constructed with reflecting-chambers connected with a chimney according to my invention, adapted for heating as well as lighting. Fig. 8 is a plan of same, partly in section in line 3 y of Fig. 7. O is the cone of an Argand gas-burner; but other kinds of l)urnersforinstance, oil'burners or a series of burners arranged annularly or otherwise-may be used. G is the metal chimney with holes H H for the emission of light, around which holes are secured to the chimney the inner ends of the conical chambers J J. O is a deflector-plate, and P a cir-- cular cover. 1 l 2 2 are inlet-holes for air, and 3 3 egress-holes for products of combustion.

Fig. 9 shows in vertical section, and Fig. 10

in plan and section, an arrangement of upper part of a railwaycarriage lamp provided with a perforated plate, N, and a deflector or guide, M, according to my invention. It will be un- (lBI'StOOd the metal chimney enters M, and that That I claim is 1. The chimney Gr, having the openings H formed at suitable positions around the chimney, being independent of each other, in combination with the parabolic or other suitablytaperingformed chambers, mounted with their small ends in the openings H and'their expanded ends bearing against the side of the lantern, whereby both the chimney and the reflectors are held in place, substantially as set forth.

2. In a lamp, the combination of the chimney G, provided with the holes H, and supported by the ends of the chambers J'J entering said holes H, with said chambers J, and with the burner 0 set diagonally in relation to the chambers, substantially as set forth, and for the purpose specified.

'r. o. J. THOMAS.

Witnesses:

JAMES G. Sroxns, 7 Whitehall Place, London. F. J. BROUGHAM, Clerk to TV. Lloyd lVi'se, London, S. W. 

